JP2008257853A - Transmitter and receiver - Google Patents

Transmitter and receiver Download PDF

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Publication number
JP2008257853A
JP2008257853A JP2008110355A JP2008110355A JP2008257853A JP 2008257853 A JP2008257853 A JP 2008257853A JP 2008110355 A JP2008110355 A JP 2008110355A JP 2008110355 A JP2008110355 A JP 2008110355A JP 2008257853 A JP2008257853 A JP 2008257853A
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signal
memory
fee
encrypted
reproduction
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JP4780138B2 (en
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Junichi Tsukamoto
純一 塚本
Koichi Goto
晃一 後藤
Shinichi Fukushima
慎一 福島
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Sony Corp
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Sony Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/804—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
    • H04N9/8042—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G—PHYSICS
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    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • G—PHYSICS
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    • G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • G11B20/00217—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source
    • G11B20/00224—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is obtained from a remote server
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    • G11B20/00217—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source
    • G11B20/00246—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is obtained from a local device, e.g. device key initially stored by the player or by the recorder
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    • G11B20/00478—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier wherein contents are decrypted and re-encrypted with a different key when being copied from/to a record carrier
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    • G11B20/00731—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction
    • G11B20/00746—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a digital rights management system for enforcing a usage restriction wherein the usage restriction can be expressed as a specific number
    • H—ELECTRICITY
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    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/254—Management at additional data server, e.g. shopping server, rights management server
    • H04N21/2543—Billing, e.g. for subscription services
    • H—ELECTRICITY
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    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
    • H04N21/4334—Recording operations
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    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
    • H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream decryption
    • H—ELECTRICITY
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    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
    • H04N21/4408—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream encryption, e.g. re-encrypting a decrypted video stream for redistribution in a home network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/472—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
    • H04N21/47202—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content for requesting content on demand, e.g. video on demand
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
    • H04N21/835—Generation of protective data, e.g. certificates
    • H04N21/8355—Generation of protective data, e.g. certificates involving usage data, e.g. number of copies or viewings allowed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/162—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
    • H04N7/163—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing by receiver means only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91307—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal
    • H04N2005/91321—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal the copy protection signal being a copy protection control signal, e.g. a record inhibit signal
    • H—ELECTRICITY
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    • H04N2005/91307—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal
    • H04N2005/91328—Television signal processing therefor for scrambling ; for copy protection by adding a copy protection signal to the video signal the copy protection signal being a copy management signal, e.g. a copy generation management signal [CGMS]
    • H—ELECTRICITY
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    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
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    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91357—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal
    • H04N2005/91364—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal the video signal being scrambled
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/82—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
    • H04N9/8205—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Security & Cryptography (AREA)
  • Databases & Information Systems (AREA)
  • Human Computer Interaction (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Circuits Of Receivers In General (AREA)
  • Television Signal Processing For Recording (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To reproduce video software only when prescribed conditions are satisfied when delivering the video software through digital broadcasting and a line. <P>SOLUTION: A receiver for receiving an encoded signal is provided with a reception means for receiving the encoded signal, a decoding means for decoding the received encoded signal, an encoding means for encoding the decoded signal again, and a supply means for supplying the re-encoded signal to a recording medium. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

この発明は、例えば、衛星を使ったディジタルテレビジョン放送で送られてきた映像を受信する受信装置及び方法に関するもので、特に、その営業利益や著作権の保護に係わる。   The present invention relates to a receiving apparatus and method for receiving, for example, video transmitted by digital television broadcasting using a satellite, and particularly relates to protection of operating profit and copyright.

衛星を使って、圧縮されたディジタルビデオ信号を送信するようにしたディジタルテレビジョン放送の実現が検討されている。このような衛星を使ったディジタルテレビジョン放送が実現されると、単なる放送局から多数の視聴者に向けて一方的に番組を提供するテレビジョン放送ばかりでなく、様々な対話的なサービスが可能になろう。すなわち、衛星を使ったディジタルテレビジョン放送では、多チャンネル化が図れる。このため、特定の視聴者を選択し、特定の人だけに特定のサービスをするというようなことが行なえる。例えば、特定のビデオソースを注文すると、そのビデオソースが注文された人に向けて、そのビデオソースの番組が送られてくる。このようなサービスを使って、ディジタルテレビジョン放送で送られてきたビデオソフトを購入したり、一定の期間や回数、借りたりするようなことが盛んに行われることになろう。   Realization of digital television broadcasting in which a compressed digital video signal is transmitted using a satellite is being studied. When digital television broadcasting using such satellites is realized, various interactive services are possible in addition to television broadcasting that unilaterally provides programs from a broadcasting station to a large number of viewers. Would. That is, in digital television broadcasting using a satellite, it is possible to increase the number of channels. For this reason, a specific viewer can be selected and a specific service can be performed only for a specific person. For example, when a specific video source is ordered, a program of the video source is sent to the person who ordered the video source. Using such a service, video software sent by digital television broadcasting will be purchased and borrowed for a certain period or number of times.

このようなサービスを実現するためには、著作権保護や営業利益を守るために、所定の条件を満足した場合のみ再生できるようにする必要がある。すなわち、ビデオソフトを衛星を使ったディジタルテレビジョン放送で購入するような際には、「料金を支払った」という条件を満足した場合のみ、再生可能とする必要がある。また、衛星を使ったディジタルテレビジョン放送で送られてきたビデオソフトを回数を限って再生する際には、「再生回数が所定値以内」という条件を満足した場合のみ、再生可能とする必要がある。衛星を使ったディジタルテレビジョン放送で送られてきたビデオソフトを期間を限ってレンタルする際には、「貸出期間中である」という条件を満足した場合のみ、再生可能とする必要がある。   In order to realize such a service, in order to protect copyright and business profits, it is necessary to allow reproduction only when a predetermined condition is satisfied. That is, when video software is purchased by digital television broadcasting using a satellite, it is necessary to make it reproducible only when the condition “paid” is satisfied. In addition, when playing back video software sent by digital television broadcasting using satellites in a limited number of times, it is necessary to be able to play back only when the condition “the number of times of playback is within a predetermined value” is satisfied. is there. When renting video software sent by digital television broadcasting using a satellite for a limited period, it is necessary to make it reproducible only when the condition “being lent” is satisfied.

なお、ディジタル回線を使って、ディジタルビデオ信号を伝送するようなシステムが考えられている。このようなシステムにおいても、衛星を使ったディジタルテレビジョン放送と同様に、様々な対話的なサービスが実現可能である。このようなディジタル回線を使ったサービスにおいても、著作権保護や営業利益を守るために、同様に、条件を満足した場合にのみ再生できるようにする必要がある。   A system for transmitting a digital video signal using a digital line has been considered. Even in such a system, various interactive services can be realized as in the case of digital television broadcasting using satellites. In such a service using a digital line, in order to protect copyright and business profits, it is necessary to be able to reproduce only when the conditions are satisfied.

したがって、この発明の目的は、ディジタル放送や回線を介してビデオソフトを配付する場合に、所定の条件を満足した場合にのみ再生可能とするようなことが行なえる受信装置及び方法を提供することにある。   Accordingly, an object of the present invention is to provide a receiving apparatus and method capable of performing reproduction only when a predetermined condition is satisfied when distributing video software via digital broadcasting or a line. It is in.

この発明は、暗号化された信号を受信する受信装置であって、暗号化された信号を受信する受信手段と、受信された信号の暗号を解除する暗号解除手段と、暗号が解除された信号を再度、暗号化する暗号化手段と、再度暗号化された信号を記録媒体に供給する供給手段とを備えることを特徴とする受信装置である。   The present invention is a receiving device for receiving an encrypted signal, a receiving means for receiving an encrypted signal, a descrambling means for releasing the encryption of the received signal, and a signal from which the cipher is released A receiving apparatus comprising: an encryption unit that encrypts the signal again; and a supply unit that supplies the encrypted signal to the recording medium again.

この発明は、暗号化された信号を受信する受信方法であって、暗号化された信号を受信し、受信された信号の暗号を解除し、暗号が解除された信号を再度、暗号化し、再度暗号化された信号を記録媒体に供給するようにしたことを特徴とする受信方法である。   The present invention is a receiving method for receiving an encrypted signal, receiving the encrypted signal, canceling the encryption of the received signal, encrypting the decrypted signal again, A receiving method is characterized in that an encrypted signal is supplied to a recording medium.

伝送されてきた信号は、暗号化して記録する。そして、再生条件を伝送し、この再生条件を再生条件記憶メモリに記憶しておく。再生時に、この再生条件記憶メモリに記憶されている条件に応じて、暗号を解読する、しないを制御する。これにより、所定の条件を満足して場合にのみ再生可能とするようなことが行なえる。   The transmitted signal is encrypted and recorded. Then, the reproduction condition is transmitted, and the reproduction condition is stored in the reproduction condition storage memory. At the time of reproduction, whether to decrypt the code is controlled according to the conditions stored in the reproduction condition storage memory. Thereby, it is possible to perform reproduction only when predetermined conditions are satisfied.

この発明によれば、伝送されてきた信号は、契約条件により暗号化されて記録され、再生条件が伝送され、この再生条件がメモリに記憶される。再生時に、このメモリに記憶されている条件に応じて、暗号を解読する、しないが制御される。これにより、所定の契約条件を満足して場合にのみ再生可能とするようなことが行なえる。   According to the present invention, the transmitted signal is encrypted and recorded according to the contract condition, the reproduction condition is transmitted, and the reproduction condition is stored in the memory. During reproduction, whether or not to decrypt the code is controlled according to the conditions stored in the memory. Thereby, it is possible to perform reproduction only when predetermined contract conditions are satisfied.

ａ．ディジタルテレビジョン放送システムの全体構成
図１は、この発明が適用できる衛星を使ったディジタルテレビション放送システムの一例である。図１において、１０１は放送局、１０２は各家庭のディジタル信号受信機である。ディジタル信号受信機１０２は、放送局からの信号に施されているスクランブルを解除すると共にＭＰＥＧ(Moving Picture Image Coding Experts Group) 又はＭＰＥＧ２のデコードを行うデコーダと、ビデオソフトの購入やレンタルを公衆回線１０６を使って行なえるようにするためのモデムと、送られてきたビデオ信号の記録／再生を行うビデオ記録／再生装置を含んでいる。 a. Overall Configuration of Digital Television Broadcasting System FIG. 1 is an example of a digital television broadcasting system using a satellite to which the present invention can be applied. In FIG. 1, 101 is a broadcasting station, and 102 is a digital signal receiver in each home. The digital signal receiver 102 cancels the scramble applied to the signal from the broadcasting station and decodes MPEG (Moving Picture Image Coding Experts Group) or MPEG2, and purchases or rents video software to the public line 106. And a video recording / reproducing apparatus for recording / reproducing the transmitted video signal.

ディジタル信号受信機１０２に設けられるビデオ記録／再生装置としては、例えば、ディジタルビデオ信号を圧縮して磁気テープに記録するディジタルＶＴＲが用いられる。このディジタルＶＴＲには、メモリ付のカセット（ＭＩＣと称される）１０４が装着される。このメモリ付カセット１０４のメモリには、後に詳述するように、「フルアクセス」、「再生不可」、「Ｎ回再生許可」、「期限Ｙまで再生許可」というような、アクセス条件が記憶される。   As a video recording / reproducing apparatus provided in the digital signal receiver 102, for example, a digital VTR that compresses a digital video signal and records it on a magnetic tape is used. A cassette (referred to as MIC) 104 with a memory is attached to the digital VTR. As will be described in detail later, access conditions such as “full access”, “reproduction not possible”, “N times reproduction permitted”, and “permission permitted until expiration date Y” are stored in the memory of the cassette 104 with memory. The

また、ディジタル信号受信機１０２には、暗号化回路及び暗号解読回路が設けられている。メモリ付カセット１０４の磁気テープには、メモリ付カセット１０４のメモリに記憶されるアクセス条件により、ビデオ信号が暗号化されずに又は暗号化されて、記録される。また、このアクセス条件により、メモリ付カセット１０４の磁気テープから、再生信号の暗号が解読されずに又は解読されて、再生される。   The digital signal receiver 102 is provided with an encryption circuit and a decryption circuit. On the magnetic tape of the cassette 104 with memory, the video signal is recorded without being encrypted or encrypted according to the access conditions stored in the memory of the cassette 104 with memory. Also, according to this access condition, the reproduction signal is reproduced without being decrypted or decrypted from the magnetic tape of the cassette 104 with memory.

ディジタル信号受信機１０２には、モニタ１０５が接続されている。ディジタル信号受信機１０２で、受信信号がデコードされ、このデコードされた信号がモニタ１０５に供給される。また、メモリ付きカセット１０４の磁気テープからビデオ信号が再生され、この再生信号が再生画像がモニタ１０５に映出される。   A monitor 105 is connected to the digital signal receiver 102. The received signal is decoded by the digital signal receiver 102, and the decoded signal is supplied to the monitor 105. In addition, a video signal is reproduced from the magnetic tape of the cassette 104 with memory, and a reproduced image is displayed on the monitor 105 as the reproduction signal.

このようなシステムでは、例えば、以下のようにして、ビデオソフトが購入され又はレンタルされる。   In such a system, for example, video software is purchased or rented as follows.

ビデオソフトを購入又はレンタルしたい場合、ユーザにより、公衆回線１０６を通じて、放送局１０１にビデオソフトが注文される。ビデオソフトが注文されると、放送局１０１でそのビデオソフトが選択され、そのビデオソフトの信号が放送局１０１から送信される。   When purchasing or renting video software, the user orders video software from the broadcasting station 101 through the public line 106. When video software is ordered, the broadcast station 101 selects the video software, and the video software signal is transmitted from the broadcast station 101.

ビデオソフトの注文形態としては、ビデオソフトの購入、又は視聴回数制限付き若しくは視聴期限付きレンタル等がある。送信信号は、例えば、ディジタルビデオ信号をＭＰＥＧに基づいて圧縮したものである。このビデオ信号は、実時間で送っても良いし、時間軸圧縮して伝送するようにしても良い。   Video software orders include video software purchases, rentals with a limited number of viewing times or viewing time limits. The transmission signal is, for example, a digital video signal compressed based on MPEG. This video signal may be sent in real time or may be transmitted after being compressed on the time axis.

放送局１０１からの信号は、衛星１０７を介して、各家庭のディジタル信号受信機１０２で受信される。この衛星１０７を介して送られてきた信号は、ディジタル信号受信機１０２でデコードされる。このビデオ信号は、メモリ付カセット１０４の磁気テープに記録することができる。   A signal from the broadcast station 101 is received by the digital signal receiver 102 in each home via the satellite 107. A signal transmitted via the satellite 107 is decoded by the digital signal receiver 102. This video signal can be recorded on the magnetic tape of the cassette 104 with memory.

ビデオソフトを購入した場合には、料金を納入していれば、ディジタル信号受信機１０２によりメモリ付カセット１０４の磁気テープに記録したビデオ信号は、いつでも再生可能となる。ビデオソフトを視聴回数制限付でレンタルした場合には、メモリ付カセット１０４の磁気テープに記録したビデオ信号は、決められた回数だけ、再生が可能になる。ビデオソフトを視聴期限付でレンタルした場合には、メモリ付カセット１０４の磁気テープに記録してビデオ信号は、決められた期限まで、再生が可能になる。   When video software is purchased, the video signal recorded on the magnetic tape of the memory-equipped cassette 104 by the digital signal receiver 102 can be reproduced at any time if a fee is paid. When the video software is rented with a viewing limit, the video signal recorded on the magnetic tape of the memory-equipped cassette 104 can be reproduced a predetermined number of times. When the video software is rented with a viewing time limit, the video signal recorded on the magnetic tape of the cassette 104 with memory can be reproduced until the determined time limit.

このように、ビデオソフトを購入したり、視聴回数制限付き若しくは視聴期限付きでレンタルするようなシステムでは、著作権保護や営業利益を守る必要がある。そこで、以下のような条件により、記録／再生を制御することが考えられる。   As described above, in a system in which video software is purchased or rented with a viewing frequency limit or a viewing time limit, it is necessary to protect copyright and operating profit. Therefore, it is conceivable to control recording / reproduction under the following conditions.

(1) 一定の条件、例えば料金納入済という条件を満たしていたら、放送されてきた番組を、無条件で記録、再生可能にする。ビデオソフトを購入するような場合に、ソフトウェアの料金が先払いされていたなら、放送された番組を自由に記録再生できるようにするための制御である。   (1) If a certain condition, for example, the condition that the fee has been paid, is satisfied, the broadcasted program can be recorded and reproduced unconditionally. When video software is purchased, if the fee for the software has been paid in advance, this is control for allowing the broadcasted program to be freely recorded and reproduced.

(2) 放送されてきた番組は一旦記録されるが、その後の一定の条件、例えば後に料金が納入されたという条件で、この記録された番組を再生できるようにする。ビデオソフトを購入或いはレンタルするような場合、放送された番組を記録した後、その料金を納付する際に、料金の納入を確認して、その再生を行えるようにするための制御である。   (2) The broadcasted program is once recorded, but the recorded program can be reproduced under certain conditions thereafter, for example, a fee is paid later. In the case of purchasing or renting video software, this is a control for confirming the delivery of the fee and enabling the reproduction when the fee is paid after recording the broadcasted program.

(3) 放送されてきた番組を記録し、その番組を一定の回数に限って、再生可能とする。ビデオソフトを視聴回数制限付きでレンタルする場合、所定の使用回数まで見られるようにするための制御である。   (3) Record the broadcast program and make it reproducible only a certain number of times. This is control for allowing video software to be viewed up to a predetermined number of times of use when the video software is rented with a limited number of viewing times.

(4) 放送されてきた番組を記録し、その番組を一定の期間に限って、再生可能とする。ビデオソフトを視聴期限付きでレンタルする場合、所定の期間まで見られるようにするための制御である。   (4) Record the broadcast program and make it reproducible only for a certain period. This is control for allowing video software to be viewed up to a predetermined period when it is rented with a viewing deadline.

ｂ．家庭の受信システムの一例
図２は、各家庭のディジタル信号受信機１０２Ａの一例を示すものである。このディジタル信号受信機１０２Ａには、メモリ付きカセット１０４Ａが装着される。メモリ付きカセット１０４Ａには、磁気テープ４０が巻装されていると共に、メモリ２９が設けられる。このメモリ２９には、後に説明するように、アクセス条件が記憶される。 b. FIG. 2 shows an example of a digital signal receiver 102A in each home. A cassette 104A with a memory is mounted on the digital signal receiver 102A. A magnetic tape 40 is wound around the cassette 104A with memory, and a memory 29 is provided. The memory 29 stores access conditions as will be described later.

このディジタル信号受信機１０２Ａには、モデム３１が設けられる。このモデム３１は、アクセス制御回路２８Ａを公衆回線１０６に接続するために設けられている。アクセス制御回路２８Ａは、ビデオソフトの購入、視聴回数制限付或いは視聴期限付のレンタル等のビデオソフトの注文形態や、料金を納入しているかどうか等に応じて、暗号化処理及び暗号解読処理を制御するものである。また、アクセス制御回路２８Ａは、メモリ付きカセット１０４Ａのメモリ２９に対して、データの読み出し／書込みを行うことができる。   The digital signal receiver 102A is provided with a modem 31. The modem 31 is provided to connect the access control circuit 28A to the public line 106. The access control circuit 28A performs an encryption process and a decryption process depending on the order form of video software such as purchase of video software, rental with a limited number of viewing times or viewing time limit, and whether or not a fee has been paid. It is something to control. The access control circuit 28A can read / write data from / to the memory 29 of the cassette 104A with memory.

図２において、衛星１０７（図１）を介して放送局１０１（図１）から送られてきたディジタルテレビジョン信号は、アンテナ１０３で受信される。この衛星１０７を介して放送局１０１から送られてくるディジタルテレビジョン信号は、ＭＰＥＧを基本として圧縮されている。また、このディジタルテレビジョン信号は、契約した特定の視聴者のみ受信が可能となるように、スクランブルされている。   In FIG. 2, a digital television signal transmitted from a broadcasting station 101 (FIG. 1) via a satellite 107 (FIG. 1) is received by an antenna 103. A digital television signal sent from the broadcasting station 101 via the satellite 107 is compressed based on MPEG. Further, the digital television signal is scrambled so that only a specific contracted viewer can receive it.

アンテナ１０３の受信信号は、チューナ回路２０に供給される。チューナ回路２０で、所定のチャンネルの信号が選択される。チューナ回路２０の出力がデスクランブラ２１Ａに供給される。デスクランブラ２１Ａで、ディジタルビデオ放送のスクランブルが解除される。   A reception signal of the antenna 103 is supplied to the tuner circuit 20. The tuner circuit 20 selects a signal of a predetermined channel. The output of the tuner circuit 20 is supplied to the descrambler 21A. The descrambler 21A releases the scramble of the digital video broadcast.

なお、ディジタルビデオ放送の信号には、料金を支払ったことを示す情報や、レンタル期限や、レンタル回数限度等の付加情報が含められる場合がある。この付加情報は、デスクランブラ２１Ａでデコードされる。更に、受信信号には時刻情報が含められる。時計２７を更新するために、この時刻情報がデスクランブラ２１Ａから時計２７に供給される。   The digital video broadcast signal may include information indicating that the fee has been paid, and additional information such as a rental deadline and a rental frequency limit. This additional information is decoded by the descrambler 21A. Furthermore, time information is included in the received signal. In order to update the clock 27, this time information is supplied from the descrambler 21A to the clock 27.

デスクランブラ２１Ａの出力が暗号化回路２２に供給される。暗号化回路２２は、アクセス制御回路２８Ａにより、暗号化のオン／オフが制御される。暗号化がオフされているときには、デスクランブラ２１Ａでデスクランブルされたビデオ信号は、そのまま記録／再生回路２３Ａに供給される。暗号化がオンされると、デスクランブラ２１Ａでデスクランブルされたビデオ信号は、暗号化回路２２で暗号化されて、記録／再生回路２３Ａに供給される。   The output of the descrambler 21A is supplied to the encryption circuit 22. Encryption on / off of the encryption circuit 22 is controlled by the access control circuit 28A. When encryption is turned off, the video signal descrambled by the descrambler 21A is supplied to the recording / reproducing circuit 23A as it is. When encryption is turned on, the video signal descrambled by the descrambler 21A is encrypted by the encryption circuit 22 and supplied to the recording / reproducing circuit 23A.

記録／再生回路２３Ａの出力がヘッド２４に供給される。ヘッド２４により、磁気テープ４０にディジタルビデオ信号が記録される。   The output of the recording / reproducing circuit 23A is supplied to the head 24. A digital video signal is recorded on the magnetic tape 40 by the head 24.

再生時には、磁気テープ４０の信号がヘッド２４で再生される。ヘッド２４の出力が記録再生回路２３Ａに供給される。記録再生回路２３Ａの出力が暗号解読回路２５に供給される。   During reproduction, the signal on the magnetic tape 40 is reproduced by the head 24. The output of the head 24 is supplied to the recording / reproducing circuit 23A. The output of the recording / reproducing circuit 23A is supplied to the decryption circuit 25.

暗号解読回路２５は、アクセス制御回路２８Ａにより、暗号解読のオン／オフが制御される。暗号解読がオフされているときには、記録／再生回路２３Ａからの再生信号は、そのままデコーダ２６に供給される。暗号解読がオンされると、記録／再生回路２３Ａからの再生信号は、暗号解読回路２５で暗号解読されて、デコーダ２６に供給される。デコーダ２６は、例えば、ＭＰＥＧのデコードを行うものである。デコーダ２６の出力がモニタ１０５に供給される。   The decryption circuit 25 is controlled to be turned on / off by the access control circuit 28A. When decryption is turned off, the reproduction signal from the recording / reproducing circuit 23A is supplied to the decoder 26 as it is. When the decryption is turned on, the reproduction signal from the recording / reproduction circuit 23A is decrypted by the decryption circuit 25 and supplied to the decoder 26. The decoder 26 performs, for example, MPEG decoding. The output of the decoder 26 is supplied to the monitor 105.

ｃ．記録時の処理について
ビデオソフトの注文は、ユーザインターフェース３０により、公衆回線１０６を使って行われる。ビデオソフトを購入する場合には、料金を払っていれば、送られてきたビデオ信号は、暗号化されずに磁気テープ４０に記録されると共に、メモリ２９に「フルアクセス情報」が記録される。この場合、暗号化されずに記録されるので、いつでも再生が可能である。 c. Processing at the time of recording The order of the video software is performed by the user interface 30 using the public line 106. In the case of purchasing video software, if a fee is paid, the transmitted video signal is recorded on the magnetic tape 40 without being encrypted, and “full access information” is recorded in the memory 29. . In this case, since it is recorded without being encrypted, it can be reproduced at any time.

ビデオソフトを視聴回数制限付きでレンタルする場合には、料金を支払っていれば、送られてきたビデオ信号は、暗号化回路２２で暗号化されると共に、メモリ２９に「Ｎ回再生許可情報」が記録される。再生時には、このメモリ２９の「Ｎ回再生許可情報」により、所定回数だけ暗号解読されるようになる。   In the case of renting video software with a limit on the number of times of viewing, if the fee is paid, the transmitted video signal is encrypted by the encryption circuit 22 and “N times reproduction permission information” is stored in the memory 29. Is recorded. At the time of reproduction, the “N times reproduction permission information” in the memory 29 is decrypted a predetermined number of times.

ビデオソフトを視聴期限付きでレンタルする場合には、料金を支払っていれば、送られてきたビデオ信号は、暗号化回路２２で暗号化されると共に、メモリ２９に「期限Ｙまで再生許可情報」が記録される。再生時には、このメモリ２９の「期限Ｙまで再生許可情報」により、期限まで暗号解読されるようになる。   When the video software is rented with a viewing time limit, if the fee is paid, the transmitted video signal is encrypted by the encryption circuit 22 and “playback permission information until the time limit Y” is stored in the memory 29. Is recorded. At the time of reproduction, decryption is performed until the expiration date by the “reproduction permission information until expiration date Y” in the memory 29.

このような制御について、以下、図３のフローチャートを参照しながら詳細に説明する。   Hereinafter, such control will be described in detail with reference to the flowchart of FIG.

ユーザがビデオソフトを購入したり、視聴回数制限付きで或いは視聴期限付きでレンタルする場合、ユーザインターフェース３０により、アクセス制御回路２８Ａに入力が与えられる。ユーザインターフェース３０によりアクセス制御回路２８Ａに入力が与えられると、アクセス制御回路２８Ａは、モデム３１、公衆回線１０６を介して、放送局１０１に接続される（ステップＳ１）。   When the user purchases video software or rents the video software with a viewing time limit or a viewing time limit, an input is given to the access control circuit 28A by the user interface 30. When an input is given to the access control circuit 28A by the user interface 30, the access control circuit 28A is connected to the broadcast station 101 via the modem 31 and the public line 106 (step S1).

アクセス制御回路２８Ａが放送局１０１に接続されると、契約状態が調べられる（ステップＳ２）。無契約の場合には、警告、回線の切断等の処理が行われる（ステップＳ３）。   When the access control circuit 28A is connected to the broadcasting station 101, the contract status is checked (step S2). If there is no contract, processing such as warning and line disconnection is performed (step S3).

契約している場合には、ビデオソフトの購入を希望しているのか、視聴回数制限付きで或いは視聴期限付きでレンタルを希望しているのかが調べられる（ステップＳ４）。購入を希望している場合には、料金が前払いされているか否か、又は今すぐ料金を支払うか否かが調べられる（ステップＳ５）。   If the contract is made, it is checked whether the video software is desired to be purchased or whether the rental is desired with a viewing time limit or a viewing time limit (step S4). If the user wishes to purchase, it is checked whether or not the fee has been paid in advance or whether or not the fee is to be paid immediately (step S5).

もし、購入を希望して、料金が前払いされているか又は料金納入操作が行われた場合には、アクセス制御回路２８Ａは、暗号化回路２２をオフする制御信号を暗号化回路２２に送ると共に、メモリ２９に、フルアクセス情報を書き込む。暗号化回路２２がオフされるので、デスクランブラ２１Ａでスクランブルされたビデオ信号は、暗号化されずに、磁気テープ４０に記録される（ステップＳ６）。   If the user wishes to purchase and the fee is paid in advance or the fee delivery operation is performed, the access control circuit 28A sends a control signal for turning off the encryption circuit 22 to the encryption circuit 22, and Full access information is written in the memory 29. Since the encryption circuit 22 is turned off, the video signal scrambled by the descrambler 21A is recorded on the magnetic tape 40 without being encrypted (step S6).

もし、購入を希望して、料金が前払いされておらず又は料金納入操作が行われない場合には、アクセス制御回路２８Ａは、暗号化回路２２をオンする制御信号を暗号化回路２２に送ると共に、メモリ２９に、「再生不可情報」を書き込む。暗号化回路２２がオンされるので、デスクランブラ２１Ａでデスクランブルされたビデオ信号は、暗号化されて、磁気テープ４０に記録される（ステップＳ７）。   If the user wishes to purchase and the fee is not paid in advance or the fee delivery operation is not performed, the access control circuit 28A sends a control signal for turning on the encryption circuit 22 to the encryption circuit 22. Then, “reproduction impossible information” is written in the memory 29. Since the encryption circuit 22 is turned on, the video signal descrambled by the descrambler 21A is encrypted and recorded on the magnetic tape 40 (step S7).

ステップＳ４で、ビデオソフトの購入を希望していない場合、視聴回数制限付きでレンタルを希望しているか否かが調べられる（ステップＳ８）。視聴回数制限付きでレンタルを希望している場合には、料金が前払いされているか否か、又は今すぐ料金を支払うか否かが調べられる（ステップＳ９）。   If the purchase of video software is not desired in step S4, it is checked whether or not the rental is desired with a limited number of viewings (step S8). If the rental is desired with the viewing number limit, it is checked whether or not the fee is paid in advance or whether or not the fee is paid immediately (step S9).

もし、視聴回数制限付きでレンタルを希望し、料金が前払いされているか又は料金納入操作が行われた場合には、アクセス制御回路２８Ａは、暗号化をオンする制御信号を暗号化回路２２に送ると共に、メモリ２９に、「Ｎ回再生許可情報」を書き込む。暗号化回路２２がオンされるので、デスクランブラ２１Ａでデスクランブルされたビデオ信号は、暗号化されて、磁気テープ４０に記録される（ステップＳ１０）。   If it is desired to rent with a limited number of viewings and the fee is paid in advance or the fee delivery operation is performed, the access control circuit 28A sends a control signal to turn on encryption to the encryption circuit 22. At the same time, “N times reproduction permission information” is written in the memory 29. Since the encryption circuit 22 is turned on, the video signal descrambled by the descrambler 21A is encrypted and recorded on the magnetic tape 40 (step S10).

もし、視聴回数制限付きでレンタルを希望し、料金が前払いされておらず又は料金納入操作が行われていない場合には、アクセス制御回路２８Ａは、暗号化回路をオンする制御信号を暗号回路２２に送ると共に、メモリ２９に、「再生不可情報」を書き込む。暗号化回路２２がオンされるので、デスクランブルされたビデオ信号は、暗号化されて、磁気テープ４０に記録される（ステップＳ７）。   If it is desired to rent with a limited number of viewings and the fee is not paid in advance or the fee delivery operation is not performed, the access control circuit 28A sends a control signal for turning on the encryption circuit to the encryption circuit 22. To the memory 29, and “reproduction impossible information” is written in the memory 29. Since the encryption circuit 22 is turned on, the descrambled video signal is encrypted and recorded on the magnetic tape 40 (step S7).

ステップＳ８で視聴回数制限付きレンタルを希望していない場合には、視聴期限制限付きレンタルを希望しているかどうかが調べられる（ステップＳ１１）。視聴期限付きレンタルを希望している場合には、料金が前払いされているか否か、又は今すぐ料金を支払うかどうかが調べられる（ステップＳ１２）。   If it is determined in step S8 that the rental with viewing number restriction is not desired, it is checked whether or not the rental with viewing time limit is desired (step S11). When the rental with viewing time limit is desired, it is checked whether or not the fee is paid in advance or whether or not the fee is paid immediately (step S12).

もし、視聴回数制限付きでレンタルを希望し、料金が前払いされているか又は料金納入操作が行われた場合には、アクセス制御回路２８Ａは、暗号化をオフする制御信号を暗号化回路２２に送ると共に、メモリ２９に、「期限Ｙ（年：月：日）まで再生許可情報」を書き込む。暗号化回路２２がオンされるので、デスクランブラ２１Ａでデスクランブルされたビデオ信号は、暗号化されて、磁気テープ４０に記録される。   If it is desired to rent with a limited number of viewings and the fee is paid in advance or the fee delivery operation is performed, the access control circuit 28A sends a control signal to turn off encryption to the encryption circuit 22. At the same time, “reproduction permission information until time limit Y (year: month: day)” is written in memory 29. Since the encryption circuit 22 is turned on, the video signal descrambled by the descrambler 21A is encrypted and recorded on the magnetic tape 40.

もし、料金が前払いされておらず又は料金納入操作が行われない場合には、ステップＳ７に行き、アクセス制御回路２８Ａは、暗号化をオンする制御信号を暗号化回路２２に送ると共に、メモリ２９に、「再生不可情報」を書き込む。暗号化回路２２がオンされるので、デスクランブラ２１Ａでデスクランブルされたビデオ信号は、暗号化されて、磁気テープ４０に記録される。   If the fee is not paid in advance or the fee delivery operation is not performed, the process goes to step S7, and the access control circuit 28A sends a control signal for turning on the encryption to the encryption circuit 22 and the memory 29. "Reproduction impossible information" is written in Since the encryption circuit 22 is turned on, the video signal descrambled by the descrambler 21A is encrypted and recorded on the magnetic tape 40.

上述のように、ビデオソフトを購入した場合には、料金を納入すると、ビデオ信号が暗号化されずに記録されると共に、メモリ２９に「フルアクセス情報」が書き込まれる。ビデオソフトを購入した場合に、料金を納入していないと、ビデオ信号が暗号化されて記録されると共に、メモリ２９に再生不可情報が記録される。   As described above, when video software is purchased, when a fee is paid, the video signal is recorded without being encrypted, and “full access information” is written in the memory 29. If the video software is purchased and no fee is paid, the video signal is encrypted and recorded, and the non-reproducible information is recorded in the memory 29.

ビデオソフトを視聴回数制限付きでレンタルして場合には、料金を納入すると、ビデオ信号が暗号化されて記録されると共に、メモリ２９に、「Ｎ回再生許可情報」が書き込まれる。ビデオソフトを視聴期限付きでレンタルした場合には、料金を納入すると、ビデオ信号が暗号化されて記録されると共に、メモリ２９に、「期限Ｙまで再生許可情報」が書き込まれる。ビデオソフトを視聴回数制限付き若しくは視聴期限付きでレンタルした場合に、料金が納入されていないと、ビデオ信号が暗号化されて記録されると共に、メモリ２９に、「再生不可情報」が記録される。   In the case of renting video software with a limited number of viewing times, when a fee is paid, the video signal is encrypted and recorded, and “N times reproduction permission information” is written in the memory 29. When the video software is rented with a viewing time limit, when the fee is paid, the video signal is encrypted and recorded, and “playback permission information until the time limit Y” is written in the memory 29. If video software is rented with a viewing limit or a viewing time limit, if no fee is paid, the video signal is encrypted and recorded, and “unreproducible information” is recorded in the memory 29. .

ｄ．再生時の処理
次に、再生時の処理について、図４のフローチャートを参照して、説明する。 d. Processing at the time of reproduction Next, processing at the time of reproduction will be described with reference to the flowchart of FIG.

先ず、料金を支払って購入したビデオソフトを再生する場合について説明する。上述のように、ビデオソフトを購入した場合、料金を納入していれば、ビデオ信号が暗号化されずに記録されていると共に、メモリ２９にフルアクセス情報が書き込まれている（ステップＳ６参照）。磁気テープ４０に記録されている信号の再生を行う場合、メモリ２９に記録されている情報が読み出される（ステップＳ２１）。ビデオソフトを購入し、料金を納入していれば、この時、「フルアクセス情報」が得られる。   First, a case where video software purchased by paying a fee is reproduced will be described. As described above, when video software is purchased, if a fee has been paid, the video signal is recorded without being encrypted and full access information is written in the memory 29 (see step S6). . When the signal recorded on the magnetic tape 40 is reproduced, the information recorded in the memory 29 is read (step S21). If you have purchased video software and paid a fee, you can get “Full Access Information” at this time.

このメモリ２９からの情報が「再生不可情報」であるか否かが調べられ（ステップＳ２２）、「再生不可情報」でなければ、「Ｎ回再生許可情報」かどうかが調べられ（ステップＳ２３）、「Ｎ回再生許可情報」でなければ、「期限Ｙまで再生許可情報」であるかどうかが調べられ（ステップＳ２４）、「期限Ｙまで再生許可情報」でなければ、「再生可能情報」であるかどうかが調べられ（ステップＳ２５）、「再生可能情報」でなければ、「フルアクセス情報」であるかどうかが調べられる（ステップＳ２６）。   It is checked whether or not the information from the memory 29 is “reproduction impossible information” (step S22). If it is not “reproduction impossible information”, it is checked whether or not it is “N times reproduction permission information” (step S23). If it is not “N times reproduction permission information”, it is checked whether or not it is “reproduction permission information until time limit Y” (step S24). Whether it is “full access information” or not is checked (step S26).

ビデオソフトを購入し、料金を既に支払っていれば、ステップＳ２６で、「フルアクセス情報」であることが判断される。「フルアクセス情報」であることが分かると、ビデオ信号はそのまま再生される（ステップＳ２７）。ビデオソフトを購入した場合、料金を納入していれば、磁気テープ４０に記録されているビデオ信号は暗号化されていないので、磁気テープ４０からの信号は、暗号解読不要である。   If the video software has been purchased and the fee has already been paid, it is determined in step S26 that it is “full access information”. If it is found that it is “full access information”, the video signal is reproduced as it is (step S27). When video software is purchased, if the fee is paid, the video signal recorded on the magnetic tape 40 is not encrypted, so that the signal from the magnetic tape 40 does not need to be decrypted.

メモリ２９からの情報が 「再生不可情報」、「Ｎ回再生許可情報」、「期限Ｙまで再生許可情報」、「再生可能情報」、「フルアクセス情報」の何れでもない場合には、アクセス制御回路２８Ａは、暗号解読をオフする制御信号を暗号解読回路２５に送り、再生は不可となる。（ステップＳ２８）。   If the information from the memory 29 is not “Non-reproducible information”, “N-time reproduction permission information”, “Reproduction permission information until time limit Y”, “Reproducible information” or “Full access information”, access control The circuit 28A sends a control signal for turning off decryption to the decryption circuit 25, and reproduction is impossible. (Step S28).

次に、料金を支払って、視聴期限付きでビデオソフトをレンタルする場合について説明する。料金を支払って、視聴期限付きでビデオソフトをレンタルした場合、磁気テープ４０にはビデオ信号が暗号化されて記録されていると共に、メモリ２９に、「期限Ｙまで再生許可情報」が書き込まれている（ステップＳ１３参照）。このメモリ２９からの情報が「再生不可情報」であるか否かが調べられ（ステップＳ２２）、「再生不可情報」でなければ、「Ｎ回再生許可情報」かどうかが調べられ（ステップＳ２３）、「Ｎ回再生許可情報」でなければ、「期限Ｙまで再生許可情報」であるかどうかが調べられる（ステップＳ２４）。料金を支払って、視聴期限付きでビデオソフトをレンタルした場合、メモリ２９からの情報は、「期限Ｙまで再生許可情報」となる。   Next, a case where video software is rented with a viewing deadline will be described. When paying a fee and renting video software with a viewing time limit, the video signal is encrypted and recorded on the magnetic tape 40, and “playback permission information until the time limit Y” is written in the memory 29. (See step S13). It is checked whether or not the information from the memory 29 is “reproduction impossible information” (step S22). If it is not “N times reproduction permission information”, it is checked whether it is “reproduction permission information until time limit Y” (step S24). When paying a fee and renting video software with a viewing time limit, the information from the memory 29 becomes “reproduction permission information until time limit Y”.

ビデオソフトを視聴期限付きでレンタルし、料金を既に支払っていれば、ステップＳ２４で、メモリ２９からの情報は「期限Ｙまで再生許可情報」であると判断される。「期限Ｙまで再生許可情報」であることが分かると、この期限Ｙと現在の年、月、日とが比較され、期限Ｙが過ぎていないかどうかが判断される（ステップＳ２９）。   If the video software is rented with a viewing time limit and the fee has already been paid, it is determined in step S24 that the information from the memory 29 is “reproduction permission information until time limit Y”. If it is found that “reproduction permission information until time limit Y”, this time limit Y is compared with the current year, month, and day, and it is determined whether or not the time limit Y has passed (step S29).

期限が過ぎていたら、アクセス制御回路２８Ａは、暗号解読をオフする制御信号を暗号解読回路２５に送り、再生は不可となる（ステップＳ２８）。   If the time limit has passed, the access control circuit 28A sends a control signal for turning off decryption to the decryption circuit 25, and reproduction is disabled (step S28).

期限内なら、アクセス制御回路２８Ａは、暗号解読をオンする制御信号を暗号解読回路２５に送る。このため、磁気テープ４０に記録されている暗号化されたビデオ信号は、解読されて再生される（ステップＳ３０）。   If it is within the time limit, the access control circuit 28A sends a control signal for turning on decryption to the decryption circuit 25. Therefore, the encrypted video signal recorded on the magnetic tape 40 is decrypted and reproduced (step S30).

次に、料金を支払って、視聴回数制限付きでビデオソフトをレンタルする場合について説明する。料金を支払って、視聴回数制限付きでビデオソフトをレンタルした場合、磁気テープ４０にはビデオ信号が暗号化されて記録されていると共に、メモリ２９に、「Ｎ回再生許可情報」が書き込まれている（ステップＳ１０参照）。メモリ２９からの情報が「再生不可情報」であるか否かが調べられ（ステップＳ２２）、「再生不可情報」でなければ、「Ｎ回再生許可情報」かどうかが調べられる（ステップＳ２３）。料金を支払って、視聴回数期限付きでビデオソフトをレンタルした場合、メモリ２９からの情報は、「Ｎ回再生許可情報」となる。   Next, a case where the video software is rented with a fee limit and a viewing frequency limit will be described. When paying a fee and renting video software with a viewing limit, the video signal is encrypted and recorded on the magnetic tape 40, and "N times reproduction permission information" is written in the memory 29. (See step S10). It is checked whether or not the information from the memory 29 is “reproduction impossible information” (step S22). If it is not “reproduction impossible information”, it is checked whether or not it is “N times reproduction permission information” (step S23). When paying a fee and renting video software with a viewing time limit, the information from the memory 29 is “N times reproduction permission information”.

ビデオソフトを視聴回数制限付きでレンタルし、料金を既に支払っていれば、ステップＳ２３で、メモリ２９からの情報は「Ｎ回再生許可情報」であると判断される。「Ｎ回再生許可情報」であると判断されると、Ｎ回の再生が終了しているかどうかが判断される（ステップＳ３１）。   If the video software is rented with a viewing number limit and the fee has already been paid, it is determined in step S23 that the information from the memory 29 is “N times reproduction permission information”. If it is determined that the information is “N times reproduction permission information”, it is determined whether or not N times of reproduction has been completed (step S31).

Ｎ回の再生が終了していれば、アクセス制御回路２８Ａは、暗号解読をオフする制御信号を暗号解読回路２５に送り、再生は不可となる（ステップＳ２８）。   If the N times of reproduction have been completed, the access control circuit 28A sends a control signal for turning off the decryption to the decryption circuit 25, and the reproduction becomes impossible (step S28).

Ｎ回の再生が終了していなければ、メモリ２９に既に記憶されていた再生不可情報が、「Ｎ−１回再生許可情報」に書き換えられる（ステップＳ３２）。そして、アクセス制御回路２８Ａは、暗号解読をオンする制御信号を暗号解読回路２５に送る。このため、磁気テープ４０に記録されている暗号化されたビデオ信号は、解読されて再生される（ステップＳ３０）。   If N times of reproduction has not been completed, the reproduction impossible information already stored in the memory 29 is rewritten to “N−1 times reproduction permission information” (step S32). Then, the access control circuit 28A sends a control signal for turning on decryption to the decryption circuit 25. Therefore, the encrypted video signal recorded on the magnetic tape 40 is decrypted and reproduced (step S30).

次に、購入時に料金を支払っていない場合について説明する。購入時に料金が支払われないと、前述したように、ビデオ信号が暗号化されて記録されていると共に、メモリ２９に、「再生不可情報」が記録されている（ステップＳ７参照）。この場合、再生時に料金を納入して、ビデオソフトを購入したり、回数期限付き又は期限付きでレンタルすることができる。   Next, a case where a fee is not paid at the time of purchase will be described. If the fee is not paid at the time of purchase, the video signal is encrypted and recorded as described above, and “unreproducible information” is recorded in the memory 29 (see step S7). In this case, a fee can be paid at the time of reproduction, and video software can be purchased or rented with a limited number of times or with a limited time.

先ず、再生時に、料金を支払って、ビデオソフトを購入する場合について説明する。   First, a case will be described in which video software is purchased by paying a fee during playback.

メモリ２９からの情報が「再生不可情報」の場合には、アクセス制御回路２８Ａが放送局１０１に接続される（ステップＳ３３）。ここで、ビデオソフトを購入希望なら、購入料金が支払われる。ビデオソフトの購入料金が支払われたかどうかが調べられ（ステップＳ３４）、購入料金が支払われたら、メモリ２９に既に記憶されていた「再生不可情報」が、「再生可能情報」に書き換えられる（ステップＳ３５）。   If the information from the memory 29 is “unreproducible information”, the access control circuit 28A is connected to the broadcast station 101 (step S33). If you wish to purchase video software, you will be charged a purchase fee. It is checked whether or not the purchase fee of the video software has been paid (step S34). When the purchase fee is paid, the “non-reproducible information” already stored in the memory 29 is rewritten to “reproducible information” (step S34). S35).

このように、ビデオソフトの購入のための料金を支払うと、メモリ２９に「再生許可情報」が記録される。メモリ２９に「再生可能情報」が記録されると、アクセス制御回路２８Ａは、暗号解読のための制御信号を暗号解読回路２５に送る。このため、磁気テープ４０に記録されたきる暗号化されたビデオ信号は、解読されて、再生される（ステップＳ３０）。   As described above, when the fee for purchasing the video software is paid, the “reproduction permission information” is recorded in the memory 29. When “reproducible information” is recorded in the memory 29, the access control circuit 28 A sends a control signal for decryption to the decryption circuit 25. Therefore, the encrypted video signal recorded on the magnetic tape 40 is decrypted and reproduced (step S30).

なお、メモリ２９に「再生可能情報」が書き込まれると、以後の再生時に、ステップＳ２５で、メモリ２９の情報が「再生可能情報」であることが判断され、以後、ステップＳ３０に行き、磁気テープ４０からの暗号化されたビデオ信号は、解読されて、再生されるようになる。   When “reproducible information” is written in the memory 29, it is determined in step S25 that the information in the memory 29 is “reproducible information” during the subsequent reproduction. The encrypted video signal from 40 is decrypted and played.

次に、再生時に、料金を支払って、ビデオソフトを視聴回数制限付きでレンタルする場合について説明する。   Next, a description will be given of a case where the video software is rented with a viewing frequency limit at the time of playback.

メモリ２９からの情報が「再生不可情報」の場合には、アクセス制御回路２８Ａが放送局１０１に接続される（ステップＳ３３）。ここで、ビデオソフトを視聴回数制限付きでレンタル希望なら、Ｎ回再生分のレンタル料金が支払われる。ビデオソフトの購入料金が支払われたかどうかが調べられ（ステップＳ３４）、購入料金が支払われていなければ、視聴回数制限付きでレンタルするか否かが調べられる（ステップＳ３６）。視聴回数制限付きでレンタルする場合、Ｎ回分の視聴料金が支払われる。   If the information from the memory 29 is “unreproducible information”, the access control circuit 28A is connected to the broadcast station 101 (step S33). Here, if the video software is desired to be rented with a viewing limit, a rental fee for N times of playback is paid. It is checked whether or not the purchase fee of the video software has been paid (step S34). If the purchase fee has not been paid, it is checked whether or not to rent with a viewing number limit (step S36). When renting with a limited number of viewings, N viewing fees are paid.

Ｎ回分の視聴料金が支払われたかどうかが調べられ、ここで、Ｎ回分の視聴料金が支払われていたら、メモリ２９に既に記憶されていた「再生不可情報」が、「Ｎ−１回再生許可情報」に書き換えられる（ステップＳ３２）。そして、アクセス制御回路２８Ａは、暗号解読をオンする制御信号を暗号解読回路２５に送る。このため、磁気テープ４０に記録されている暗号化されたビデオ信号は、解読されて再生される（ステップＳ３０）。   It is checked whether or not the viewing fee for N times has been paid. If the viewing fee for N times has been paid, the “non-reproducible information” already stored in the memory 29 is “N-1 times to allow reproduction”. Information "is rewritten (step S32). Then, the access control circuit 28A sends a control signal for turning on decryption to the decryption circuit 25. Therefore, the encrypted video signal recorded on the magnetic tape 40 is decrypted and reproduced (step S30).

次に、再生時に、料金を支払って、ビデオソフトを視聴期限付きでレンタルする場合について説明する。   Next, a case where the video software is rented with a viewing time limit by paying a fee at the time of reproduction will be described.

メモリ２９からの情報が再生不可情報の場合には、アクセス制御回路２８Ａが放送局１０１に接続される（ステップＳ３３）。ここで、ビデオソフトを視聴期限付きでレンタル希望なら、レンタル料金が支払われる。ビデオソフトの購入料金が支払われたかどうかが調べられ（ステップＳ３４）、料金が支払われていなければ、視聴回数制限付きでレンタルするか否かが調べられ（ステップＳ３６）、Ｎ回分の視聴料金が支払われていなければ、期限Ｙまでのレンタル料金が支払われたかどうかが調べられる（ステップＳ３７）。   If the information from the memory 29 is non-reproducible information, the access control circuit 28A is connected to the broadcast station 101 (step S33). Here, if you want to rent video software with a viewing deadline, you will be paid a rental fee. It is checked whether or not the purchase fee of the video software has been paid (step S34). If the fee has not been paid, it is checked whether or not to rent with a limited number of times of viewing (step S36). If it has not been paid, it is checked whether or not the rental fee up to the deadline Y has been paid (step S37).

期限Ｙまでのレンタル料金が支払われたなら、メモリ２９に既に記憶されていた「再生不可情報」が、「期限Ｙまでの再生可能情報」に書き換えられる（ステップＳ３８）。そして、アクセス制御回路２８Ａは、暗号解読をオンする制御信号を暗号解読回路２５に送る。このため、磁気テープ４０に記録されている暗号化されたビデオ信号は、解読されて再生される（ステップＳ３０）。   If the rental fee up to the time limit Y has been paid, the “non-reproducible information” already stored in the memory 29 is rewritten to “reproducible information up to the time limit Y” (step S38). Then, the access control circuit 28A sends a control signal for turning on decryption to the decryption circuit 25. Therefore, the encrypted video signal recorded on the magnetic tape 40 is decrypted and reproduced (step S30).

ｇ．変形例
なお、上述の実施例では、メモリ付きのカセット１０４Ａを用い、アクセス条件をメモリ付きカセット１０４Ａのメモリ２９に記憶するようにしたが、アクセス条件のメモリは、メモリ付きカセット１０４Ａのメモリ２９に限定されるものではない。図５に示すように、カセット１０４Ｂの磁気テープ４０の例えばサブコードエリアを、アクセス条件を記憶するメモリとして用いるようにしても良い。 g. In the above embodiment, the cassette 104A with memory is used and the access condition is stored in the memory 29 of the cassette 104A with memory. However, the access condition memory is stored in the memory 29 of the cassette 104A with memory. It is not limited. As shown in FIG. 5, for example, the subcode area of the magnetic tape 40 of the cassette 104B may be used as a memory for storing access conditions.

また、上述の実施例では、暗号化回路２２及び暗号解読回路２５を設け、暗号化及び暗号解読をする／しないによりアクセス制御をしているが、このような暗号を用いる代わりに、図６に示すように、デスクランブラ２１Ｃの動作をアクセス制御回路２８Ｃで制御し、デスクランブルを解く／解かないでアクセスを制御するようにしても良い。   In the above-described embodiment, the encryption circuit 22 and the decryption circuit 25 are provided, and access control is performed by performing encryption / decryption. Instead of using such encryption, FIG. As shown, the operation of the descrambler 21C may be controlled by the access control circuit 28C, and access may be controlled without or without solving the descrambling.

更に、図７に示すように、カセット１０４Ｃの磁気テープ４０の例えばサブコードエリアをアクセス条件を記憶するメモリとして用いると共に、デスクランブラ２１Ｃの動作をアクセス制御回路２８Ｃで制御し、デスクランブルを解く／解かないでアクセスを制御するようにしても良い。   Further, as shown in FIG. 7, for example, the subcode area of the magnetic tape 40 of the cassette 104C is used as a memory for storing access conditions, and the operation of the descrambler 21C is controlled by the access control circuit 28C to solve the descrambling / You may make it control access without solving.

また、上述の例では、放送局からの情報は回線を介して送られているが、これらの情報をテレビジョン放送の付加情報として送るようにしても良い。また、情報と共に、暗号化のキーを送るようにしても良い。   In the above example, information from the broadcasting station is sent via a line, but such information may be sent as additional information for television broadcasting. Also, an encryption key may be sent together with the information.

また、上述の例では、公衆回線を使って、放送局と各家庭の受信システム端末とでデータ通信を行なえるようにし、ビデオソフトの注文や付加情報をデータで送るようにしているが、ユーザが電話を使って直接ビデオソフトの注文を行い、それに対する付加情報を返答してもらい、その付加情報を各受信システムに入力するようにしても良い。   In the above example, the public line is used to enable data communication between the broadcasting station and each home receiving system terminal, and video software orders and additional information are sent as data. It is also possible to place an order for video software directly using the telephone, have the additional information returned in response, and input the additional information to each receiving system.

また、この発明は、ビデオ信号の伝送やデータの伝送を回線を用いて行うようなシステムにおいても同様に適用することができる。   The present invention can be similarly applied to a system in which video signal transmission and data transmission are performed using a line.

この発明が適用できる衛星を使ったディジタルテレビジョンシステムの概要を示す斜視図である。It is a perspective view which shows the outline | summary of the digital television system using the satellite which can apply this invention. この発明の一実施例の説明に用いるブロック図である。It is a block diagram used for description of one Example of this invention. この発明の一実施例の説明に用いるフローチャートである。It is a flowchart used for description of one Example of this invention. この発明の一実施例の説明に用いるフローチャートである。It is a flowchart used for description of one Example of this invention. この発明の他の実施例の説明に用いるブロック図である。It is a block diagram used for description of the other Example of this invention. この発明の他の実施例の説明に用いるブロック図である。It is a block diagram used for description of the other Example of this invention. この発明の他の実施例の説明に用いるブロック図である。It is a block diagram used for description of the other Example of this invention.

符号の説明Explanation of symbols

２２ 暗号化回路
２５ 暗号解読回路 22 Cryptographic circuit 25 Cryptographic decryption circuit

Claims (10)

暗号化された信号を受信する受信装置であって、
暗号化された信号を受信する受信手段と、
上記受信された信号の暗号を解除する暗号解除手段と、
上記暗号が解除された信号を再度、暗号化する暗号化手段と、
上記再度暗号化された信号を記録媒体に供給する供給手段とを備えることを特徴とする受信装置。 A receiving device for receiving an encrypted signal,
Receiving means for receiving the encrypted signal;
A descrambling means for decrypting the received signal;
An encryption means for encrypting the decrypted signal again;
A receiving device comprising: a supply means for supplying the re-encrypted signal to a recording medium. 上記暗号解除手段は、所定の契約が行われているか否かに応じて、受信した信号の暗号を解除するようにしたことを特徴とする請求項１に記載の受信装置。   2. The receiving apparatus according to claim 1, wherein the descrambling means decrypts the cipher of the received signal according to whether or not a predetermined contract is made. さらに、上記記録媒体から再生された信号が供給され、該再生された信号の暗号を解除する第２の暗号解除手段とを備えることを特徴とする請求項２に記載の受信装置。   The receiving apparatus according to claim 2, further comprising: a second descrambling unit that is supplied with a signal reproduced from the recording medium and decrypts the reproduced signal. 上記供給手段は、上記再度暗号化された信号の再生条件情報を上記記録媒体に供給し、上記第２の暗号解除手段は上記記録媒体から再生された再生条件情報に基づいて暗号化された信号の暗号を解除することを特徴とする請求項３に記載の受信装置。   The supply means supplies the reproduction condition information of the re-encrypted signal to the recording medium, and the second descrambling means encrypts the signal based on the reproduction condition information reproduced from the recording medium. The receiving apparatus according to claim 3, wherein the encryption is canceled. 上記第２の暗号解除手段は、上記暗号化された信号の記録後に取得された再生条件情報に基づいて、暗号化された信号の暗号を解除することを特徴とする請求項３に記載の受信装置。   4. The reception according to claim 3, wherein the second descrambling means decrypts the encrypted signal based on the reproduction condition information obtained after recording the encrypted signal. apparatus. 暗号化された信号を受信する受信方法であって、
暗号化された信号を受信し、
上記受信された信号の暗号を解除し、
上記暗号が解除された信号を再度、暗号化し、
上記再度暗号化された信号を記録媒体に供給するようにしたことを特徴とする受信方法。 A receiving method for receiving an encrypted signal, comprising:
Receive the encrypted signal,
Decrypt the received signal,
Encrypt the decrypted signal again,
A receiving method characterized in that the re-encrypted signal is supplied to a recording medium. 上記暗号の解除は、所定の契約が行われているか否かに応じて、受信した信号の暗号を解除するようにしたことを特徴とする請求項６に記載の受信方法。   7. The receiving method according to claim 6, wherein the encryption is canceled according to whether or not a predetermined contract is made. さらに、上記記録媒体から再生されて供給された信号の暗号を解除するようにしたことを特徴とする請求項７に記載の受信方法。   8. The receiving method according to claim 7, further comprising: descrambling a signal reproduced and supplied from the recording medium. 上記再度暗号化された信号を記録媒体に供給する際に、該再度暗号化された信号の再生条件情報も上記記録媒体に供給し、上記記録媒体から再生された再生条件情報に基づいて、上記記録媒体から再生されて供給された信号の暗号解除を行うことを特徴とする請求項８に記載の受信方法。   When supplying the re-encrypted signal to the recording medium, the reproduction condition information of the re-encrypted signal is also supplied to the recording medium, and based on the reproduction condition information reproduced from the recording medium, 9. The receiving method according to claim 8, wherein the decryption of the signal reproduced and supplied from the recording medium is performed. 上記記録媒体から再生されて供給された信号の暗号解除は、該暗号化された信号の記録後に取得された再生条件情報に基づいて、行われることを特徴とする請求項８に記載の受信方法。   9. The receiving method according to claim 8, wherein the descrambling of the signal reproduced and supplied from the recording medium is performed based on reproduction condition information acquired after recording the encrypted signal. .
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